Buggy code:
private Vector targets = new Vector ( ) ; private boolean targetAttributeSet = false ; public Ant ( ) { } public Ant ( Task owner ) { } public void setInheritAll ( boolean value ) { } public void setInheritRefs ( boolean value ) { } public void init ( ) { } private void reinit ( ) { } private void initializeProject ( ) { } public void handleOutput ( String outputToHandle ) { } public int handleInput ( byte [ ] buffer , int offset , int length ) throws IOException { } public void handleFlush ( String toFlush ) { } public void handleErrorOutput ( String errorOutputToHandle ) { } public void handleErrorFlush ( String errorOutputToFlush ) { } public void execute ( ) throws BuildException { File savedDir = dir ; String savedAntFile = antFile ; Vector locals = new Vector ( targets ) ; try { if ( ( newProject ) == null ) { reinit ( ) ; } if ( ( ( dir ) == null ) && ( inheritAll ) ) { dir = getProject ( ) . getBaseDir ( ) ; } initializeProject ( ) ; if ( ( dir ) != null ) { newProject . setBaseDir ( dir ) ; if ( savedDir != null ) { newProject . setInheritedProperty ( PROJECT_BASEDIR , dir . getAbsolutePath ( ) ) ; } } else { dir = getProject ( ) . getBaseDir ( ) ; } overrideProperties ( ) ; if ( ( antFile ) == null ) { antFile = Main . DEFAULT_BUILD_FILENAME ; } File file = Ant . FILE_UTILS . resolveFile ( dir , antFile ) ; antFile = file . getAbsolutePath ( ) ; log ( ( ( ( "calling<seq2seq4repair_space>target(s)<seq2seq4repair_space>" + ( ( locals . size ( ) ) > 0 ? locals . toString ( ) : "[default]" ) ) + "<seq2seq4repair_space>in<seq2seq4repair_space>build<seq2seq4repair_space>file<seq2seq4repair_space>" ) + ( antFile ) ) , MSG_VERBOSE ) ; newProject . setUserProperty ( ANT_FILE , antFile ) ; String thisAntFile = getProject ( ) . getProperty ( ANT_FILE ) ; if ( ( ( thisAntFile != null ) && ( file . equals ( getProject ( ) . resolveFile ( thisAntFile ) ) ) ) && ( ( getOwningTarget ( ) ) != null ) ) { if ( getOwningTarget ( ) . getName ( ) . equals ( "" ) ) { if ( getTaskName ( ) . equals ( "antcall" ) ) { throw new BuildException ( ( "antcall<seq2seq4repair_space>must<seq2seq4repair_space>not<seq2seq4repair_space>be<seq2seq4repair_space>used<seq2seq4repair_space>at" + "<seq2seq4repair_space>the<seq2seq4repair_space>top<seq2seq4repair_space>level." ) ) ; } throw new BuildException ( ( ( ( ( getTaskName ( ) ) + "<seq2seq4repair_space>task<seq2seq4repair_space>at<seq2seq4repair_space>the" ) + "<seq2seq4repair_space>top<seq2seq4repair_space>level<seq2seq4repair_space>must<seq2seq4repair_space>not<seq2seq4repair_space>invoke" ) + "<seq2seq4repair_space>its<seq2seq4repair_space>own<seq2seq4repair_space>build<seq2seq4repair_space>file." ) ) ; } } try { ProjectHelper . configureProject ( newProject , file ) ; } catch ( BuildException ex ) { throw ProjectHelper . addLocationToBuildException ( ex , getLocation ( ) ) ; } if ( ( locals . size ( ) ) == 0 ) { String defaultTarget = newProject . getDefaultTarget ( ) ; if ( defaultTarget != null ) { locals . add ( defaultTarget ) ; } } if ( ( newProject . getProperty ( ANT_FILE ) . equals ( getProject ( ) . getProperty ( ANT_FILE ) ) ) && ( ( getOwningTarget ( ) ) != null ) ) { String owningTargetName = getOwningTarget ( ) . getName ( ) ; if ( locals . contains ( owningTargetName ) ) { throw new BuildException ( ( ( ( getTaskName ( ) ) + "<seq2seq4repair_space>task<seq2seq4repair_space>calling<seq2seq4repair_space>" ) + "its<seq2seq4repair_space>own<seq2seq4repair_space>parent<seq2seq4repair_space>target." ) ) ; } boolean circular = false ; for ( Iterator it = locals . iterator ( ) ; ( ! circular ) && ( it . hasNext ( ) ) ; ) { Target other = ( ( Target ) ( getProject ( ) . getTargets ( ) . get ( it . next ( ) ) ) ) ; circular |= ( other != null ) && ( other . dependsOn ( owningTargetName ) ) ; } if ( circular ) { throw new BuildException ( ( ( ( ( ( ( getTaskName ( ) ) + "<seq2seq4repair_space>task<seq2seq4repair_space>calling<seq2seq4repair_space>a<seq2seq4repair_space>target" ) + "<seq2seq4repair_space>that<seq2seq4repair_space>depends<seq2seq4repair_space>on" ) + "<seq2seq4repair_space>its<seq2seq4repair_space>parent<seq2seq4repair_space>target<seq2seq4repair_space>\'" ) + owningTargetName ) + "\'." ) ) ; } } addReferences ( ) ; <START_BUG> if ( ( ( locals . size ( ) ) > 0 ) && ( ! ( ( ( locals . size ( ) ) == 1 ) && ( ( locals . get ( 0 ) ) == "" ) ) ) ) { <END_BUG> BuildException be = null ; try { log ( ( ( "Entering<seq2seq4repair_space>" + ( antFile ) ) + "..." ) , MSG_VERBOSE ) ; newProject . fireSubBuildStarted ( ) ; newProject . executeTargets ( locals ) ; } catch ( BuildException ex ) { be = ProjectHelper . addLocationToBuildException ( ex , getLocation ( ) ) ; throw be ; } finally { log ( ( ( "Exiting<seq2seq4repair_space>" + ( antFile ) ) + "." ) , MSG_VERBOSE ) ; newProject . fireSubBuildFinished ( be ) ; } } } finally { newProject = null ; Enumeration e = properties . elements ( ) ; while ( e . hasMoreElements ( ) ) { Property p = ( ( Property ) ( e . nextElement ( ) ) ) ; p . setProject ( null ) ; } if ( ( ( output ) != null ) && ( ( out ) != null ) ) { try { out . close ( ) ; } catch ( final Exception ex ) { } } dir = savedDir ; antFile = savedAntFile ; } } private void overrideProperties ( ) throws BuildException { } private void addReferences ( ) throws BuildException { } private void copyReference ( String oldKey , String newKey ) { } private void addAlmostAll ( Hashtable props ) { } public void setDir ( File dir ) { }

Fix:
if ( ( ( locals . size ( ) ) > 0 ) && ( ! ( ( ( locals . size ( ) ) == 1 ) && ( "" . equals ( locals . get ( 0 ) ) ) ) ) ) {